Question

请帮我解决部分功能。在函数中我创建了一个for循环，它应该计算字符串中每个单词开头的合适字母。例如，如果我将字符串“Beautiful skies”传递给函数和char的''，则在for循环之后变量“count”必须等于1，但它不会发生。有什么问题？我在编码方面相当新手，但是这个对我来说是正确的，但由于某种原因，这个for循环不能像我预期的那样工作（这只是整个函数的一部分，但问题在于for循环，因为它总是返回NULL，即使有一些合适的字母）：

char** rearrange_string(char *str, char letter, int *size) 
{
    char *search, **array, upper_letter = toupper(letter), *shift;
    int count = 0, i=0, j=0, counter;
    for (search = str; *search != '\0'; search++) {
        if (*search == ' ') {
            continue;
        }
        if (*search != letter || *search != upper_letter) {
            while (*search != ' ') {
                search++;
                if (*search == '\0') {
                    break;
                }
            }
            continue;
        }
        if (*search == letter || *search == upper_letter) {
            count++;
            while (*search != ' ') {
                search++;
                if (*search == '\0') {
                    break;
                }
            }
        }
    }
    if (count == 0) {
        printf("There is no suitable data. Please reinput the string.");
    return NULL;
}

Answer 1

*search != letter || *search != upper_letter

如果true

，

总是letter != upper_letter

将其更改为：

*search != letter && *search != upper_letter

Answer 2

使用字符串Dim data As String = """grant_type"": ""client_credentials""" Dim postdata As Byte() = Encoding.UTF8.GetBytes(data) Dim req As HttpWebRequest = DirectCast(HttpWebRequest.Create(uploadURL), HttpWebRequest) req.Method = "POST" req.ContentType = "application/json;encoding=utf-8" req.ContentLength = postdata.Length req.Accept = "application/json" req.Credentials = New NetworkCredential(userID, userPW) req.Timeout = 600000 req.Headers.Add("Authorization", userID & ":" & userPW)运行时，程序缓冲区溢出，因为"Beautiful skies"超出了原始字符串。在search的情况下，您将*search == letter递增到search，然后*search==0在循环结束时再次递增，因此它超出了分配的缓冲区。

以下分析显示：

https://taas.trust-in-soft.com/tsnippet/t/419a23ac

Answer 3

谢谢你们！问题出在for循环的第一个if语句中。我应该把＆amp;＆amp;而不是||。谢谢！如果有人想看整个程序，这里是一个完整的代码：

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <ctype.h>

char** rearrange_string(char *str, char letter, int *size);

void main()
{
  int size=0, i=0;
  char *str, letter, **array;
  printf("Enter the string and press ENTER to check: ");
  gets(str);
  printf("Enter the character for check (only lower chars!): ");
  scanf("%c", &letter);
  array = rearrange_string(str, letter, &size);
  if (array == NULL)
  {
    printf("\nNo data found, please relaunch the program.");
    return;
  }
  printf("The output string(s) is(are):\n");
  for (i=0; i<size; i++)
  {
    printf("%s", array[i]);
    printf("\n");
  }
  printf("size: %d", size);
  for (i=0; i<size; i++)
  {
    free(array[i]);
  }
  free(array);
}

char** rearrange_string(char *str, char letter, int *size)
{
  char *search, **array, upper_letter = toupper(letter), *shift;
  int count = 0, i=0, j=0, counter;
  for (search = str; *search != '\0'; search++)
  {
    if (*search == ' ')
    {
      continue;
    }
    if (*search != letter && *search != upper_letter)
    {
      while (*search != ' ')
      {
        search++;
        if (*search == '\0')
        {
          break;
        }
      }
      continue;
    }
    if (*search == letter || *search == upper_letter)
    {
      count++;
      while (*search != ' ')
      {
        search++;
        if (*search == '\0')
        {
          break;
        }
      }
    }
  }
  if (count == 0)
  {
    printf("There is no suitable data. Please reinput the string.");
    return NULL;
  }
  *size = count;
  array = (char**)malloc(count*sizeof(char*));
  for (search = str; *search != '\0'; search++)
  {
    if (*search == ' ')
    {
      continue;
    }
    if (*search != letter && *search != upper_letter)
    {
      while (*search != ' ')
      {
        search++;
        if (*search == '\0')
        {
          break;
        }
      }
      continue;
    }
    if (*search == letter || *search == upper_letter)
    {
      counter = 1;
      j=0;
      shift = search;
      while (*search != ' ')
      {
        counter++;
        search++;
        if (*search == '\0')
        {
          break;
        }
      }
      array[i] = (char*)malloc(counter*sizeof(char));
      while (*shift != ' ')
      {
        *(*(array+i)+j) = *shift;
        j++;
        shift++;
        if (*shift == '\0')
        {
          break;
        }
      }
      *(*(array+i)+j) = '\0';
      i++;
    }
  }
  return array;
}

Answer 4

这样的功能怎么样？：

Installing C# dependencies...
Platform: darwin, x86_64

Downloading package 'OmniSharp for OSX' (24026 KB) .................... Done!
Downloading package '.NET Core Debugger (macOS / x64)' (44057 KB) .................... Done!

Installing package 'OmniSharp for OSX'
Installing package '.NET Core Debugger (macOS / x64)'

Finished

此代码将返回字符串中找到的字符数，例如：

printf（“％li \ n”，count_char（“美丽的天空”，“s”））;

将打印：

1

用C语言计算字符串中单词的合适首字母

4 个答案: